The zoo added that Bei Bei took his first steps around 4:50 p.m. ET on Monday under the watchful eye of his mother Mei Xiang. “Now that he’s got all four paws under him, Bei Bei will begin to wander around and leave the den on his own to explore the indoor enclosure,” it said.

Bei Bei is the survivor of a pair of panda twins born on Aug. 22. The cub’s twin died on Aug. 26.